Included in the bin folder are three "auth" files (auth1, auth2, and auth3). These allow for extra access to DLC encryption and decryption functions that were hidden in the program itself. auth1 allows for C3 encryption, auth2 allows for C3 decryption, and auth3 allows for decryption of Harmonix DLC.

Evidently, the community at large didn't deserve access to the decryption functionality, so it was hidden away with the presence of the auth files used to gain access to it. These files were derived from a decompilation of the program and the release of them is why the program was pulled from the C3 website in late 2021. To date, C3 has yet to release an updated build of C3 CON Tools, decryption stripped or otherwise. (Note that a user named Maxton is credited in the about for "classified" contributions; Maxton was instrumental in cracking the encryption versions in the first place.)

Ongoing beef from that community, plus the lack of a solid, available mirror of a full copy of the program, motivated this reupload.